| http://www.w3.org/ns/prov#value | - In particular, suitable catalysts include anthraquinone compounds, especially anthraquinone, and anthraquinone sulfonic acid derivatives, such as anthraquinone-2,7-disulfonic acid or anthraquinone-2-sulfonic acid, or salts thereof, in particular the sodium or potassium salts, especially anthraquinone-2,7-sulfonic acid, disodium or dipotassium salt.
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